Coaster-brake.



G. ZIMMERMAN.

COASTER BRAKE. APPLICATION FILED SEP T.14, 1911 Patented Feb. 27, 1912.

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awuemto'a UNITED sures PATENT OFFICE.

GUY ZIMMERMAN, OF VERSAIIiLES, ILLINOIS.

COASTER-BRAKE g To all whoin it may concern:

Be it known that I, GUY ZDIAIERMAN, citizen of .the United States, residing at Versailles, in the county .of Brown and State of Illinois, have invented certain new and useful Improvements in Coaster- Brakes, of which the following is a specification.

This invention relates to coaster brakes forbicycles and motor-cycles and aims to provide a coaster brake which will be positive in its action and will not be liable to look when the brake is applied.

Also the invention aims to provide a brake of this type of such construction that it will not differ in appearance from the 'ordinary rear wheel hub.

The invention aims further to provide-a coaster brake so constructed that its driving parts "will not slip when the rider of the bicycle or motor cycle to which the brake is applied, pedals forwardly after having coasted. V

In the accompanying drawing, Figure l is a View in elevation of the brake embodying the present invention, the hub of the brake being shown in longitudinal section. Fig. 2 is a vertical longitudinal sectional view through the brake.

cal transverse sectional view on the line 3 -3 of Fig. 1 looking in the direction indicated by the arrow. Fig. 4 is a similar view on the line 4-4 of Fig. 1, looking in the direction indicated by the arrows. Fig.

5 is a grou perspective view illustrating several of t e p'arts'of the brake in position to be assembled.

Corresponding and like parts are referred to in the following description and indicated inall the views'of the. accompanying drawing by the same reference characters. l

In the drawings there is shown a hub 1 which constitutes a part of the coaster brake 6 mechanism embodying the present invention and takes the place of the ordinary rear wheel hub of the bicycle. or motorcycle to which the brake is applied, this hub being provided exteriorly with the usual flanges 2 for the attachment of the .wheel spokes and being provided adjacent one end with a ball-race 3 and ad jacont its other end with a ball=raoe 4. The spindle for the hub is indicated by the numeral 5 and is threaded at one end as at 6 and at I the other end as at 7. This spindle 5 is of a Specification of Letters Patent.

Fig. 3 is a verti Patented Feb. 27, 1912.

Application filed September 14, 1911. Serial No. 649,242.

length to extend entirely through the hub traveling over the bearing face of the cone 8. The ball-race 10 in the head 9 is preferably formed at, the bottom of a recess 12 in the outer side of the said head and the bearing cone 8 is partly received in this recess as illustrated in Fig. '2 of the drawings.

The head!) is'cxteriorly threaded as at '13 and a sprocket gear 1 is removably fitted thereon and is held in place by a cap 15 also threaded upon the portion 13 of the head 9 and bearing against the said sprocket gear. The head 9 is formed atv its inner end with a ball-race 16 which, when the inner end of the head is properly fitted into the right hand end of the hub in Figs. 1 and 20f the drawings, opposes the race 4-, and bearing balls 17 are arranged within the two races.

A sleeve 18 projects inwardly from the inner face of the head 9 and is formed ex tcriorl with threads 19 and the said head has an opening 20 formed therethrongh in axial alinenu-ni't with the bore of the sleeve 18, :ind the spindle passes through the said bore of the sleeve and through the opening 20 as illustrated in Fig. .2 of the drawings. A clutch cone 21 is threaded onto the sleeve 18 and'has a'sorrated clntelr face 22 designed to cooperate with a similar face 23 formed interiorlyof the hnb immediately inwardly of the ball-race 4 therein.

For a purpose to be. presently explained, the inwardly presented face of the clutch cone 21 is formed with a. series of radially extended teeth 24.

Removably threaded upon the portion 6 of the spindle 5 is a bearing cone 25 having a ball-race 26 opposing the race 3, there being bearing balls 27 arranged in the said races. The outer face of this hearing cone is formed with a nun'iber of teeth 28 or is otherwise roughened so as to bear against the inner'side of that rear fork of the bicycle or motorzycle frame through which this end of the spindle is fitted,. there being a. nut 29 6threaded upon the said end of the spindle nd bearing against the outer side of the said fork. At this point it may be stated that a nut 30 is threaded upon the opposite end of the spindle and the other rear fork is confined between this threaded drical shell, respectivel The shell is alsoformed at its outer an inner ends, respectively, with notches 36 and 37 located directly opposite the notches 34 and '35 respectively and the cylindrical extension-31 ofthe bearing cone 25 is formed with lugs 38 which enga e in the notches 34 and 36 and serve to hid the expansible sleeve against rotation with respect to the said cone 25. The

.shell is slightly tapered exteriorly from its outer to its inner end as clearly shown in Figs. 1 and 2 of the drawings and is formed interiorly at its inner end with a conical face 39. For coiiperation with the clutch cone 21 there is provided a cone 40 having radial teeth 41 upon its outer face presented toward and arranged, to cooperate with the teeth 24 upon the inner face of said clutch cone 21 and this cone 40 is slidable upon the spindle 5 and has'bearing against. it one end 42 of a spring 43 which has its other end 44 bearing against the inner face of the bearing cone 25 and surrounded by the cylindrical extension 31 otthis said-cone. The spring 43 serves to firmly hold the cone 40 in the direction of the clutch cone, the cone 40 luring limited in its movement in this-direction by the abutment of its outer face against the inner ends of the threaded sleeve 18 upon the head 9. The none 40 has its inwardly presented conical side 45 fitting into the inner end of the erfpansible shell 32 and against the conical bearing face 39 thereof'and it wilLhe readily understood at this point that should'the cone 40 be forced to the left in Fig. 2 of the drawings against the tension of the spring 13, the

expansihle shell 32 will be expanded within the hub l and against the inner wall thereof. The cone 40 is forn'ied with oppositely located lugs '46 which engage in the notches 35 and 37 at the said inner end of the conical shell, the said cone 40 being in this man ner held against rotation with respect to the said shell. p It will be observed from 'insp ection of Fig. 5 of the drawings that the end helices of the spring 43 a e in a plane at right rotation of the sleeve 18 will serve to draw the sleeve 18 and the expanding cone 40 'the cone. It is thought that without furangles to the axis of the spring, and that consequently there will be no tendency for the cone 40 to cant.

The operation of the brake is as follows :As the rider of the bicycle or motorcycle to which the brake embodying the present invention is applied, pedals forwardly, the sprocket 14 will be rotated for-- wardly and the threaded sleeve 18 will be rotated in a corresponding direction. This the clutch cone 21 to the right in Figs. 1 and 2 of the drawings until its serrated clutch face 22v is in clutching engagement with the clutch face 23 withm the hub 1.

Continued rotationof the sprocket I l and' .the clutch cone in a forward direction will degree as to bring its clutch face 22 out' of clutch engagement with the face 23 within the hub. The hub will be free to rotate forwardly independently of the sprocket,

1%; also the teeth 24 will, upon such 1inthreading of the clutch cone 21 be brought into engagement with'the teeth 41 upon the expanding cone 40. Should the rider wish to apply the brake, he back pedals, thereby rotating the sprocket 1'4.rearwardly,and inasmuch as the clutch cone 21 is held against rotation in a rearward direction, by the engagement of its teeth 2t with the teeth 41, of the expanding cone 40, the saidclutch cone will be further unthreaded from will be forced to the left in Figs. 1 and2 of the drawings and into the inner end of the expansible shell This movement of the expanding cone into. the expansihle shell, will serve to expand the latter againstthe inner surface of the hub 1, thereby retarding or preventing forward rotation of the hub. Such movement. of the expanding cone is, of course, against. the tension of the spring 43 and-due to the fact that the expansihle shell 32 isres'ilient and is provided with the conical surface 39 coiiperating with the end of the expan lingcone 40, and the shell has a tendency to contract, the tendency will of course be for the shell to eject ther explanation it Wlll be apparent that when the operator desires to coast he may do so by merely releasing the backward Should the rider desire to coast, be

I pressure upon the pedals and that he may propel the bicycle forwardly byj pedaling forwardly Having thus described the invention what is claimed as new is 1. In a coaster brake, a fixed spindle, a' head rotatable upon the spindle, a bearing member fixed upon-the spindle, an expansible shell fitted to the' bearing member andfixed with relation thereto, an expanding cone fitting into the shell and slidable upon the spindle and arranged, when slid in the direction of the shell, to expand the same, the head being provided with an exteriorly threaded sleeve extension, a clutch cone threaded thereon and having a' clutch face and arranged upon its inner side to clutch with the expanding cone, and a hub surroundingthe shell and clutch and-expansible cones and rotatable between the head and the bearing member andprovided interiorly with a clutch surface for cotiperating with the clutch face of the clutch-cone.

In a coaster brake, a fixed spindle, a'

head rotatable upon the spindle, a bearing member fixed upon the spindle, an expansible sleeve fitted to the bearing member and formed with 'a' notch, the bearin member being provided with a' lug engaging in the notch in the sleeve whereby to hold the sleeve fixed with relation to the bearing member, an expansiblc cone fitted into the shell and slidable upon the spindle and arranged, when slid in the direction of the shell to expand the same, the said expanding cone being provided with :1 lug and the expansible shell having a notch receiving the lug whereby the cone is held against rotation with relation to the shell, the head being provided with an exteriorly threaded sleeve extension, a clutch cone threaded thereon and having a clutch. face and arranged, upon its inner side to clutch with the expanding cone, and a hub surrounding the shell and the clutch and expanding cones and rotatable between the head and the bearing member and provided interiorly with a clutch surface for coiiperating with the clutch face of the clutch-cone.

3. In a coaster brake, afixed spindle, a head rotatable'upon the spindle, a bearing member fixed upon the spindle, an expansible shell fitted to the bearing member and fixed with relation thereto, an'expanding cone fitting into the shell and slidable upon the spindle, and arranged when slid in the direction of the shell, to expand the same, the head being provided with an exteriorly threaded sleeve extension, a clutch cone threaded thereon and having a clutch face and arranged upon its inner side to clutch with the expanding cone, the clutch cone having a serrated clutch face, and a hub surrounding the shell and the clutch and ex pending cones and rotatable between the head and the bearing member and provided interiorly with a clutch surface for cooperation with the serrated clutch faced the clutch cone.

4. In a coaster brake, a fixed spindle, a head rotatable upon the spindle, a bearing member fixed upon the spindle, an expansible shell fitted to the bearing member and fixed with relation thereto, the said shell having a normal tendency to-contract, an expansible cone fitting in the shell and slidable upon the spindle and arranged, when slid-in the direction of the shell to expand the same, the said expansible cone having its ortion fitting within the shell of the conlcal cone and the shell having an internal conical surface portion cooperating with the said portion of the cone, the tendency of the shell to contact serving to normally tend to force the expanding cone from the shell, the head being provided with an ex teriorl threaded sleeve extensiorna clutch cone t readed thereon and having a clutch face and arranged upon its innerside to clutch with the expanding cone, a spring arranged within the shell and bearing at one end against the bearing member and at its other end against the ex anding cone, and a hub surrounding the s ell and the clutch and expanding cones and rotatable between the head and the bearing member and provided interiorlv with a clutch surface for cooperating with the clutch face of the clutch-cone.

-5. In a coaster brake, a fixed spindle, a head rotatable upon the spindle, abearing member fixed upon the spindle and having an inwardly projecting cylindrical extension, an expansible sh'ell fitted at one end upon the-said extension and exteriorly tapered in the direction of its other end and provided at its latter end exteriorly with a conical surface portion, means holding the expansible shell against rotation, an expanding cone having a conical portion fitting within the last mentioned end of the expansible shell, a spring extending at one end into the cylindrical extension of the bearing member and at its other end hearing against the expanding-cone, thesaid expanding cone bein slidable upon the spindle and arranged, w en slid in the direction of the shell, to expand the same, the head being provided with an exteriorly threaded sleeve extension, a clutch cone threaded thereonand having a clutch face and ar ranged upon its inner side to clutch with the expanding cone and when moved toward the same, and a hub surrounding the shell and clutch and expanding cones and rotatable between the head and the bearing member, the said hub being provided interiorly with a surface portion for cotiperation with the clutch member.

6.--In a coaster brake, a fixed spindle, a

I head rotatable upon the spindle, a bearing member fixed upon the. spindle, an expansible shell fitted to the bearing member and fixed with relation thereto, an expanding cone fitting into the shell and slidable upon the spindle and arranged, when slid in the direction of the shell, to expand the same,

the head being provided with-an exteriorly threaded sleeve extension projecting in the direction of the expanding cone, a spring bearing against the other side 'of the said expanding cone and tending to normally hold the same against the endrof the sleeve ,-extension, a clutch cone threaded upon the sleeve extension and having a clutch face arranged upon its inner side to clutch with 7. In-a coaster brake, a fixed spindle, a head rotatable upon the spindle, an expansi ble shell surrounding the spindle, means for holding the shell against rotation, a rotatablehub inclosing the shell, an expanding cone fitting into the shell and slidable with respect to the spindle and arranged, when slid in the direction ofthe shell, to ex and the same, the head being provided wit ah exteriorly threaded sleeve extension, the hub being provided interiorly with a clutch face, and a clutch-cone threaded upon the sleeve extension of the head and having'a clutch face for cooperation with the clutch face of the hub, and a clutch face'for cooperation with the expand-ing cone.

In testimon whereof I afiix my signature in presence 0 two witnesses. 4

GUY ZIMMERMAN. [Lfs] Witnesses:

Gno. JAQUES, S. H. SoANnANn. 

